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To capture motion blur we need to use longer shutter speeds. In the
example of capturing waterfalls with silk like appearance we used shutter
speeds in the order of ½ to 2 seconds long. To achieve these longer
times, especially in brighter ambient lighting we need to use neutral
density filters to reduce the amount of light entering the lens.
Common values of ND4 give 2 f-stops reduction and the ND8 will give 3
f-stops reduction in light. You may also need to use the lowest ISO as
well (100) and a small aperture (f 7.1) to achieve these longer shutter
speeds required to capture these types of shot. Obviously such long
shutter speeds will need the camera to be very stable for this exposure.
Use of tripod, bean bag or other mechanical means, to hold the camera
rigid is essential. Use the self timer or remote shutter cable to make the
exposure to prevent any camera movement.
So the essence here is to analyse which component you need to
concentrate on to produce the effect you want to see in your image.
There are some other situations which will also direct you into which
mode to put the camera in to capture good images.
So called “low light” photography is one of those areas.
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